The long-awaited construction project that will eliminate the rotary off of Interstate 93’s Exit 46 will begin as soon as this month, according to the state Department of Transportation. Officials recently held a meeting with residents to talk about construction phases and plans, including changing traffic patterns, which will be announced via electronic message boards two weeks in advance. Construction is expected to take four years and is designed to improve safety and congestion in the area. The current rotary manages traffic for Routes 110 and 113 as well as two roads and on and off ramps for I-93. The cost of the project is estimated at $66.4 million.